Megachile (Chelostomoides) campanulae ( Robertson, 1903 )

Pritchard, Zoe A., Ivie, Michael A., O’Neill, Kevin M. & Delphia, Casey M., 2025, A faunal treatment of the Megachile (Hymenoptera: Megachilidae) of Montana with a key for their identification, Zootaxa 5683 (1), pp. 1-51 : 30

Megachile (Chelostomoides) campanulae ( Robertson, 1903)

Oligotropus campanulae Robertson, 1903: 171 . Megachile (Chelostomoides) campanulae ; Mitchell 1934: 301; 1937d: 389; 1956: 136; 1962: 182. Raw 2002: 7. Gonzalez 2008:

37. Scott et al. 2011: 54. Sheffield et al. 2011: 28. Drons 2012: 58. Reese et al. 2018: 21. Delphia et al. 2019a: 24. Chalicodoma (Chelostomoides) campanulae ; Hurd 1979: 2073. Megachile campanulae ; Burkle et al. 2020: 7. Chelosomoides (Chelosomoides) campanulae ; Engel 2020: 10. Oligotropus wilmingtoni Mitchell, 1924: 156 . Megachile angelarum , not Cockerell, 1902 (misidentification); Reese et al. 2018: 21. Delphia et al. 2019b: 24. Burkle et al.

2020: 7. LaManna et al. 2020: Supplementary Material pg. 40.

Diagnosis. The female of M. campanulae can be identified by its subparallel metasoma (viewed dorsally) ( Fig. 6C ), mandibles without cutting edges, clypeal margin that is medially emarginate and laterally crenulate, a medially incomplete T5 apical setal band that is thinner and less plumose than T1–4 apical setal bands, vertex of head with large, sparse punctation (ca. 4–6 punctures between lateral ocelli and posterior margin of vertex), close and evenly spaced scutum punctation compared to irregular and inconsistent scutellum punctation, and a line of punctures on the occipital suture appearing as a slight carina. Females of M. campanulae are most similar to M. angelarum (see M. angelarum above) (see Taxonomic Challenges). The male of M. campanulae can be identified by its retracted S4 and large, sparse punctation on the vertex of the head (ca. 4 punctures between lateral ocelli and posterior margin of vertex). Males of M. campanulae are most similar to M. angelarum (see M. angelarum above).

Notes. In Montana, M. campanulae has been collected in scattered western and eastern localities ( Fig. 1E ). These mason bees use plant resins, not leaves, to construct nest cells in existing cavities or trap nests ( O’Neill & O’Neill 2016) and are therefore not leafcutting bees. Because of misidentifications noted above in the synonymical table, the morphological description of the female in Sheffield et al. (2011) is not accurate. See Table 2, Supplementary Material 2: Erroneous Records, and Taxonomic Challenges for further explanation.The vouchers for the misidentified specimens ( Reese et al. 2018; Burkle et al. 2020; LaManna et al. 2020) are in the Burkle Community Ecology Lab at Montana State University identified as female M. campanulae (5718LR, 19730CHS, 68812LR, 64728LR, 1725CHS, 73A817LR). The vouchers for the misidentified specimens ( Delphia et al. 2019b) are in the O’Neill Research Collection at Montana State University identified as female M. campanulae (KMOC #1435, KMOC #1436, KMOC #1437) ( Table 2).

Figures

FIGURE 1. County-level distribution of each Megachile species in Montana. Females identified as Megachile latimanus/ Megachile perihirta (and data without recorded specimen sexes) are counted here as M. perihirta as they are not distinguishable from one another in Montana. Males identified as Megachile lapponica/Megachile relativa (and data without recorded specimen sexes) are counted here as M. relativa as they are not distinguishable from one another in Montana. Mitchell county records are included on maps but not in specimen counts. Two specimens did not have county-level localities and are not included in maps but are included in specimen counts.

FIGURE 6. Female Megachile characters. (A) Ventral view of metasoma with white apical setal bands on S2–6, (B) Dorsal view of rounded metasoma, widest at T2–3, (C) Dorsal view of subparallel metasoma, (D–H) Anterior view of clypeus: (D) M. apicalis, (E) M. mellitarsis, (F) M. fidelis, (G) M. lippiae, (H) M. coquilletti, (I) Lateral view of mandible gradually tapering in width towards apex, (J) Lateral view of mandible with base square-shaped with parallel sides for a distance as long as wide, then tapering apically, and (K) Lateral view of mandible square basally, with sides parallel for approximately ⅓ the length of mandible, then tapering apically.